CN1225312C

CN1225312C - Razor blade for shredding paper and its molding technique

Info

Publication number: CN1225312C
Application number: CN 03115518
Authority: CN
Inventors: 黄铭玉
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-02-25
Filing date: 2003-02-25
Publication date: 2005-11-02
Anticipated expiration: 2023-02-25
Also published as: CN1431064A

Abstract

The present invention relates to a moulding process of a blade with cutting angle shredded paper, which comprises the following steps: the moulding process of the blade with the cutting angle shredded paper comprises the following steps that baiting is punched by an edge surface of the blade in a taper under the action of an upper punching die and a lower punching die by using a stretch moulding process firstly, so the circumference of the blade can be punched with an acute angle; meanwhile, the circumference of an edge can be generated with burrs by using gaps between the upper punching die and the lower punching die, and the blade is punched and formed for the second time by using an upper shaping die and a lower shaping die, so the burrs on the periphery of the blade can be formed into a knife edge provided with cutting angles. The present invention causes the blade with the cutting angle shredded paper to move from design to products, and the present invention cleverly uses original processing moulds and devices and does not need novel production investment, so the manufacturing cost is not increased. In addition, a shredded paper blade provided with a smaller cutting angle beta and a skew angle theta can also be manufactured in the moulding process, so the blade can be sharper, and the present invention further reduces the requirements to motor power (electric type) or requirements to users (manual type) by preventing paper sheets from clamping between adjacent blades.

Description

A kind of blade for shredding paper that has corner cut

Technical field

The present invention relates to a kind of shredder parts, particularly a kind of blade for shredding paper that has corner cut.

Background technology

Existing shredder, no matter be electronic or manual, all be to utilize its blade for shredding paper that waste paper is cut to elongate strip, usually, the roughly rounded or bowl-type of blade for shredding paper, in groups string solid two be arranged in parallel and relatively turnable cutter shaft on, when cutter shaft rotates, under the extruding of blade, be cut to thin paper slip through the paper between the set of blades, the shredded paper ability of shredder is generally weighed with maximum paper numbers that set of blades once can be cut, because the user always expects that its paper to be pulverized is to be pulverized in the minimum time, therefore, to make it that the shredded paper ability improves be the problem that shredder manufacturer need solve to structure how to improve the blade for shredding paper group always.For this reason, the patent No. is that 98219980.5 Chinese utility model patent " the paper shredding blade module that is used for shredder " (notification number is CN2366176Y) has disclosed the blade for shredding paper that a kind of its periphery has annular corner cut (50), make it under equal situation, once can cut more paper, the noise that is produced in the time of cut paper can also being reduced simultaneously.This patent is mentioned in its specification, and the corner cut of described paper shredding blade only need be revised the diel of paper shredding blade, moulding together when the punching press paper shredding blade.And practice shows, paper shredding blade with corner cut is difficult to one time punching molded, even one time punching molded success, its angle is also bigger, and according to the introduction of this patent, the width of this corner cut is 1 to 4 times of blade average thickness, also be that its tangent value is between 1～1/4, also promptly this corner cut and in fact, is to be difficult to go out near 14 ° corner cut by one time punching molded between 14 °～45 °.On the other hand, no matter be traditional bowl-type blade for shredding paper, or the above-mentioned blade for shredding paper that has corner cut, the peripheral position at its blade place is all in the same plane, though this can guarantee that blade for shredding paper is perpendicular with cutter shaft after installation, strengthening its cut paper ability, but cut paper also is sandwiched between the adjacent blade because of being attached to blade side easily, thereby increases the load of motor or manual strength.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of periphery more sharp blade for shredding paper at above-mentioned prior art present situation.

Another technical problem to be solved by this invention is to provide a kind of blade for shredding paper that is difficult for holding paper at above-mentioned prior art present situation.

The present invention solves the problems of the technologies described above the technical scheme that is adopted: this has the blade for shredding paper of corner cut, and its peripheral position has corner cut α, it is characterized in that also having a corner cut β littler than corner cut α in its outer most edge.

Described blade for shredding paper also can have such architectural feature further: promptly form a skew angle θ between the formed plane of its circumferential outer edge and its peripheral side, the existence of this skew angle θ can avoid cut paper to be attached to the side of blade effectively, thereby avoids paper to be sandwiched between the adjacent blade.

Compared with prior art, the present invention not only has corner cut α at peripheral position, and have than the littler corner cut β of corner cut α and have the blade for shredding paper of skew angle θ, make blade more sharp, and by avoiding paper to be sandwiched between the adjacent blade, further reduce the power requirement (electrodynamic type) of motor or to user's requirement (hand), thereby reduce manufacturing cost (electrodynamic type) or convenient use (hand).

Description of drawings

Fig. 1 is the structural representation of inventive embodiments after the moulding first time.

Fig. 2 is the partial enlarged drawing of Fig. 1.

The structural representation that Fig. 3 is the embodiment of the invention when second time moulding.

Fig. 4 is the finished product structural representation of the embodiment of the invention after the moulding second time.

Fig. 5 is the partial enlarged drawing of Fig. 4.

The specific embodiment

Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.

As Fig. 1～shown in Figure 5, be one embodiment of the present of invention, the moulding process of band corner cut blade for shredding paper may further comprise the steps:

1. utilize stretch forming process, under stamping die 2 acts on up and down, with blade 1 sword face tapering bar stock cutting by punching, make blade 1 peripheral punching press in an acute angle, the gap about utilizing simultaneously between the stamping die 2 makes the blade periphery produce burr, referring to Fig. 1, Fig. 2;

2. sizing die 3 blade 1 are carried out the punching press shaping second time again about utilizing, and make its peripheral burr integer become to have the edge of a knife of corner cut α, β, and referring to Fig. 3, Fig. 4, the corner cut β littler than corner cut α makes blade more sharp.

And according to above-mentioned moulding process, the blade for shredding paper 1 of institute's moulding also has such architectural feature: promptly form a skew angle θ between the formed plane of its circumferential outer edge and its peripheral side, referring to Fig. 5; The existence of this skew angle θ can avoid cut paper to be attached to the side of blade 1 effectively, thereby avoids paper to be sandwiched between the adjacent blade.

Claims

1, a kind of blade for shredding paper that has corner cut, its peripheral position has corner cut α, it is characterized in that also having a corner cut β littler than corner cut α in its outer most edge.

2, the blade for shredding paper that has corner cut according to claim 1 is characterized in that having a skew angle θ between the formed plane of its circumferential outer edge and its peripheral side.

3, the blade for shredding paper that has corner cut according to claim 2 is characterized in that described skew angle θ is 1～15 °.